College fests: garbage pail kids?

A bunch of students who got together to form the Green Festival Initiative would like college fests to clean up their act:

The GFI team collected over 63,000 branded Pepsi and Nestle cups. Pet bottles totalled 2,700, along with 43,000 plastic spoons and forks.
The banner audit showed that 16,459 sq feet of banners made of PVC or other plastic material were put up by 23 sponsors. Hutch, Nokia and Sunsilk accounted for 14,400 sq ft, or 91 percent of the non-biodegradable banners.

That was generated by the hugely popular IIT Madras festival, which is right near a wildlife sanctuary:

The sanctuary has about 3,000 spotted deer (about 300 of them roaming in the IIT area itself) and about 700 blackbucks, besides monkeys, foxes, pangolins and a variety of birds.
Supervisor of IIT's civic team, K.S. Pannerselvam said, "Attracted by the sweet residues in disposable cups, monkeys and deer often consume the entire container and sometime they die."

Given the intelligence and creativity of the average IIT student, I'm pretty sure they can come up with a solution--perhaps one that could be exported to other college fests across the country.